--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/attr-target-mv.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,102 @@
+// RUN: %clang_cc1 -triple x86_64-linux-gnu  -fsyntax-only -verify %s
+
+void __attribute__((target("sse4.2"))) no_default(void);
+void __attribute__((target("arch=sandybridge")))  no_default(void);
+
+void use1(void){
+  // expected-error@+1 {{no matching function for call to 'no_default'}}
+  no_default();
+}
+
+void __attribute__((target("sse4.2"))) has_def(void);
+void __attribute__((target("default")))  has_def(void);
+
+void use2(void){
+  // expected-error@+2 {{reference to overloaded function could not be resolved; did you mean to call it?}}
+  // expected-note@-4 {{possible target for call}}
+  +has_def;
+}
+
+int __attribute__((target("sse4.2"))) no_proto();
+// expected-error@-1 {{multiversioned function must have a prototype}}
+// expected-note@+1 {{function multiversioning caused by this declaration}}
+int __attribute__((target("arch=sandybridge"))) no_proto();
+
+// The following should all be legal, since they are just redeclarations.
+int __attribute__((target("sse4.2"))) redecl1(void);
+int __attribute__((target("sse4.2"))) redecl1(void) { return 1; }
+int __attribute__((target("arch=sandybridge")))  redecl1(void) { return 2; }
+
+int __attribute__((target("sse4.2"))) redecl2(void) { return 1; }
+int __attribute__((target("sse4.2"))) redecl2(void);
+int __attribute__((target("arch=sandybridge")))  redecl2(void) { return 2; }
+
+int __attribute__((target("sse4.2"))) redecl3(void) { return 0; }
+int __attribute__((target("arch=ivybridge"))) redecl3(void) { return 1; }
+int __attribute__((target("arch=sandybridge")))  redecl3(void);
+int __attribute__((target("arch=sandybridge")))  redecl3(void) { return 2; }
+
+int __attribute__((target("sse4.2"))) redecl4(void) { return 1; }
+int __attribute__((target("arch=sandybridge")))  redecl4(void) { return 2; }
+int __attribute__((target("arch=sandybridge")))  redecl4(void);
+
+int __attribute__((target("sse4.2"))) redef(void) { return 1; }
+int __attribute__((target("arch=ivybridge"))) redef(void) { return 1; }
+int __attribute__((target("arch=sandybridge")))  redef(void) { return 2; }
+// expected-error@+2 {{redefinition of 'redef'}}
+// expected-note@-2 {{previous definition is here}}
+int __attribute__((target("arch=sandybridge")))  redef(void) { return 2; }
+
+int __attribute__((target("default"))) redef2(void) { return 1;}
+// expected-error@+2 {{redefinition of 'redef2'}}
+// expected-note@-2 {{previous definition is here}}
+int __attribute__((target("default"))) redef2(void) { return 1;}
+
+int __attribute__((target("sse4.2"))) mv_after_use(void) { return 1; }
+int use3(void) {
+  return mv_after_use();
+}
+
+// expected-error@+1 {{function declaration cannot become a multiversioned function after first usage}}
+int __attribute__((target("arch=sandybridge")))  mv_after_use(void) { return 2; }
+
+int __attribute__((target("sse4.2,arch=sandybridge"))) mangle(void) { return 1; }
+//expected-error@+2 {{multiversioned function redeclarations require identical target attributes}}
+//expected-note@-2 {{previous declaration is here}}
+int __attribute__((target("arch=sandybridge,sse4.2")))  mangle(void) { return 2; }
+
+// allow this, since we want to treat the 1st one as fwd-decl of the sandybridge version.
+int prev_no_target(void);
+int __attribute__((target("arch=sandybridge")))  prev_no_target(void) { return 2; }
+int __attribute__((target("arch=ivybridge")))  prev_no_target(void) { return 2; }
+
+int __attribute__((target("arch=sandybridge")))  prev_no_target2(void);
+int prev_no_target2(void);
+// expected-error@-1 {{function declaration is missing 'target' attribute in a multiversioned function}}
+// expected-note@+1 {{function multiversioning caused by this declaration}}
+int __attribute__((target("arch=ivybridge")))  prev_no_target2(void);
+
+void __attribute__((target("sse4.2"))) addtl_attrs(void);
+//expected-error@+1 {{attribute 'target' multiversioning cannot be combined}}
+void __attribute__((used,target("arch=sandybridge")))  addtl_attrs(void);
+
+//expected-error@+1 {{attribute 'target' multiversioning cannot be combined}}
+void __attribute__((target("default"), used)) addtl_attrs2(void);
+
+//expected-error@+2 {{attribute 'target' multiversioning cannot be combined}}
+//expected-note@+2 {{function multiversioning caused by this declaration}}
+void __attribute__((used,target("sse4.2"))) addtl_attrs3(void);
+void __attribute__((target("arch=sandybridge")))  addtl_attrs3(void);
+
+void __attribute__((target("sse4.2"))) addtl_attrs4(void);
+void __attribute__((target("arch=sandybridge")))  addtl_attrs4(void);
+//expected-error@+1 {{attribute 'target' multiversioning cannot be combined}}
+void __attribute__((used,target("arch=ivybridge")))  addtl_attrs4(void);
+
+int __attribute__((target("sse4.2"))) diff_cc(void);
+// expected-error@+1 {{multiversioned function declaration has a different calling convention}}
+__vectorcall int __attribute__((target("arch=sandybridge")))  diff_cc(void);
+
+int __attribute__((target("sse4.2"))) diff_ret(void);
+// expected-error@+1 {{multiversioned function declaration has a different return type}}
+short __attribute__((target("arch=sandybridge")))  diff_ret(void);